Word |
Definition |

absolute value |
a number’s distance from zero |

acute angle |
an angle less than 90 degrees |

additive inverse |
what you add to a number to get zero, the negative of a number |

adjacent angles |
angles that have a common side and a common vertex, angles that are “next to” each other |

algebraic expression |
a mathematical phrase that contains numbers, variables and operations |

alternate exterior angles |
a pair of angles on opposite sides of the transversal but outside the two parallel lines |

alternate interior angles |
a pair of angles on opposite sides of the transversal but inside the two parallel lines |

circumference |
the distance around a circle |

coefficient |
the number in front of a variable |

complementary angles |
angles that add to 90 degrees |

compound event |
two or more simple events occurring at the same time |

commutative property |
states that numbers can be added or multiplied in any order |

constant of proportionality |
the constant value of the ratio of two proportional quantities, the constant in a proportional relationship |

corresponding angles |
when two parallel lines are crossed by a transversal, the angles in matching corners |

cross-section |
a view into the inside of a three dimensional object made by cutting through it |

diameter |
a straight line going through the center of a circle connecting two points on the circumference |

dilation |
to make a shape larger or smaller |

distributive property |
says that multiplying a number by a group of numbers is the same as multiplying separately |

edge |
a line segment joined by two vertices |

elimination |
a method of solving systems of equations in which you eliminate one variable and solve for the other |

enlargement |
when the scale drawing is larger than the original |

equation |
a statement that two expressions are equal |

experimental probability |
the ratio of the number of times an event occurs to the total number of trials, what actually happens during an experiment |

exterior |
outside |

face |
the flat surface of a geometric solid |

favorable outcome |
the outcome of interest, what you want to happen |

fundamental counting principle |
states that if one event has m possible outcomes and another event has n possible outcomes, then there are mxn possible outcomes for the two events together |

horizontal |
parallel to the horizon, left to right |

hypotenuse |
the side of a triangle that is across from the right angle |

inequality |
says that two values are not equal |

integer |
any whole number, positive or negative |

interior |
inside |

intersecting lines |
two lines that share exactly one point |

interquartile range |
a measure of variability based on dividing the data into quartiles (4 equal sections) |

inverse operation |
opposite operations that undo each other |

isosceles triangle |
a triangle that has two sides of equal length |

like terms |
terms with the same variable and exponent |

linear equation |
an equation between two variables that is a straight line when graphed |

lower quartile |
the first quartile, anything below this is the lowest 25% of the data |

mean |
average |

median |
the middle number when data is listed in order from least to greatest |

mode |
the number that appears most often |

negative integer |
an integer that is less than zero |

net |
the two-dimensional view of a three-dimensional figure, a pattern you can cut and fold to make a 3D shape |

obtuse angle |
an angle greater than 90 degrees |

opposites |
numbers with the same absolute value but on opposite sides of zero |

outlier |
A value that "lies outside" (is much smaller or larger than) most of the other values in a set of data. |

parallel |
side by side having the same distance continuously between them, lines that never cross |

percent error |
a measure of how inaccurate a guess was written as a percent |

perimeter |
the distance around a shape |

perpendicular |
lines that cross at 90 degree angles |

population |
the entire group available |

positive integer |
an integer that is greater than zero |

possible outcome |
all of the possible results that could occur with a given event |

probability |
the likelihood (chances) of something happening |

proportion |
two fractions set equal to each other |

radius |
the distance from the center of a circle to a point on the circumference of the circle (half of the diameter) |

range |
the smallest number in a data set subtracted from the largest number |

rate of change |
a rate that describes how one quantity changes in relation to another quantity (slope) |

ratio |
shows the relative sizes of two or more values |

rational number |
a number that can be written as a fraction |

reciprocal |
multiplicative inverse, two numbers multiplied together to get one (means flip) |

reduction |
when the scale drawing is smaller than the original |

reflection |
a type of transformation that creates a mirror image |

right angle |
a 90 degree angle |

rotation |
a type of transformation that has a circular movement, there is a central point that stays fixed while everything else moves around that point in a circle |

sample |
a group taken from the population |

sample space |
all of the possible outcomes of an event written in a list |

scale drawing |
a drawing that shows a real object with accurate sizes, reduced or enlarged by a certain amount |

scale factor |
the ratio of the scale drawing to the original, tells you how much bigger or smaller the drawing will get |

scalene triangle |
a triangle with three unequal sides |

slope |
how steep a line is, calculated by: change in y / change in x or rise over run |

solution set |
the set of all values that make an equation or inequality true |

substitution |
a method of solving systems of equations in which you isolate one variable and use that solution to solve for the other variable |

supplementary angles |
angles that add to 180 degrees |

surface area |
the total area of all the surfaces of a three-dimensional object |

symmetry |
when one shape becomes exactly like another when you flip, slide, or turn it |

theoretical probability |
the likeliness of an event happening based on all the possible outcomes (what you think should happen) |

transformation |
a general term for four specific ways to change a point, line or shape |

translation |
a type of transformation that moves an object a certain distance |

transversal |
a line that passes through a set of two or more lines (usually parallel) |

tree diagram |
a tool used in statistics that allows us to calculate the number of possible outcomes of an event, as well as list those possible outcomes in an organized manner. |

unit rate |
a comparison of two measurements in which one of the terms has a value of 1 |

upper quartile |
the third quartile, anything above this is the largest 25% of the data |

variable |
a letter used to represent an unknown number |

vertex |
a point where two or more lines (edges) meet |

vertical |
in an up and down direction or position |

vertical angles |
angles that are opposite each other when two lines intersect |

volume |
the amount of three-dimensional space an object occupies |

y-intercept |
where a line crosses the y-axis |